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The Link Monitor object allows you to monitor a link for a specific interface and belongs to a link detection group. Link Monitor verifies transport on a specific interface via Layer 3 ICMP/ARP/NUD to a specific destination, or monitors the Media Independent Interface (MII) state for the physical port.

A new Link Monitor is created on an interface for link verification. The Link Monitor is provided with a destination to use for link verification as well as the Link Detection Group to which it belongs. The Link Monitor is responsible for pinging that destination, processing responses and determining when the interface should be considered failed. It reports such failures to its Link Detection Group. The active and standby SBC should be connected to different physical hardware (that is, switches) to avoid a single point of failure.

Each Link Monitor that is configured can also be configured with unique values for the Verify Timer, Response Timer, Reattempt Timer, and Maximum Retries. If configured, these values override the values configured for the Link Detection Group.

Each Link Monitor will set a timer while waiting to perform its next verification. The timeout for this timer is based on the configured Verify Timer value value. When a ping is in progress and the Link Monitor is awaiting the response from the destination, a timer is set based on the configured Response Timervalue value. When the response times out and the Link Monitor retries, the Reattempt Timervalue  value is used while waiting for the response.

When the number of consecutive failures reaches the Maximum Retriesvalue value, the Link Monitor considers the link verification as failed and reports this to its Link Detection Group.

While in the failed state, the Link Monitor will continue to attempt to ping the destination so that the failed condition can eventually clear. This is done at the rate specified by the Verify Timer.

The Link Monitor also supports a NULL destination (0.0.0.0), which disables the link verification for that interface. The interface is still considered failed if there is a hardware failure.

To View Link Monitor Objects

On the SBC main screen, go to Configuration > System Provisioning > Category: Base Provisioning > Link Detection Group > Link Monitor. The Link Monitor window is displayed.

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0 Figure 1 Link Monitor
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The Link Monitor can be checked for each Address Context or for each Link Detection Group or for all the Address Contexts and Link Detection Groups created. Use opens. Use the drop-down box to select the desired lists to filter by Address Context and Link Detection Group. 

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0title Figure 1 Link Monitor Main Field
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To Edit Link Monitor

To edit any of the Link Monitors in the list, click the radio button next to the specific Link Monitor name.

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0 Figure 1 Link Monitor Highlighted
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The Edit Selected Link Monitor window is displayed below.

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0 Figure 1 Link Monitor Edit Window
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To Create a Link

Monitor 

To create a new Link Monitor, click New Link Monitor tab on the Link Monitor List panel.

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0 Figure 1 Link Monitor Fields
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:

1. Select the Address Context and Link Detection Group with which you want to associate the Link Monitor. The option to create a Link Monitor becomes available.

2. Click New Link Monitor. The Create New Link Monitor window is displayed. 

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   0 Figure 1 Create New Link Monitor

1. Window - Example

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2. Use the following table to enter values and click Save.

To

Edit a Link Monitor

To copy edit any of the created Link Monitor and to make any minor changes, click Link Monitors in the list:

1. Click the radio button next to the specific Link

1. Monitor name. The Edit Selected Link Monitor window opens.
2. Make the required changes and click Save.

To Copy a Link Monitor

To copy any of the Link Monitors in the list:

1. Click the radio button next to the specific Link Monitor to copy.
2. Click Copy Link Monitor. The Copy Selected Link Monitor window opens.
3. Make the required changes and click Save.

To Delete a Link Monitor

To delete any of the Link Monitors in the list: 

1. Click

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0 Figure 1 Link Monitor Highlighted
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Click Copy Link Monitor tab on the Link Monitor List panel.

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0 Figure 1 Link Monitor Fields
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The Copy Selected Link Monitor window is displayed along with the field details which can be edited.

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0 Figure 1 Link Monitor Copy Window
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Make the required changes to the required fields and click Save to save the changes. The copied Link Monitor is displayed at the bottom of the original Link Monitor in the Link Monitor List panel.

To Delete Link Monitor

1. the radio button next to the specific Link Monitor

1. to delete.

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0 Figure 1 Link Monitor Highlighted
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1. Click the delete icon (X) at the end of the

1. row.

2. Confirm the deletion when prompted.

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0 Figure 1 Link Monitor Delete Confirmation
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Click Yes to remove the specific Link Monitor from the list.